Negligent act, error or omission

'Negligent act, error or omission' is the historic professional indemnity insuring trigger that responds to liability arising out of an alleged breach of professional duty in the tort of negligence, narrower in scope than the modern civil liability wording.

Definition §

A negligent act, error or omission clause is an insuring trigger that responds where the insured incurs liability arising out of, or attributable to, a negligent act, a negligent error or a negligent omission committed in the conduct of the professional business ^[1]. The wording reflects the three forms in which professional negligence is usually pleaded: an affirmative act done negligently (for example, signing the wrong contract); an error in the doing (a calculation mistake); or an omission to do something a reasonably competent professional would do (failing to file a return).

The trigger is narrower than civil liability because it imports the elements of the tort of negligence into the insuring clause itself. To engage cover the claimant must allege facts capable of constituting breach of a duty of care at common law; pure contractual liability, strict statutory liability and liability in equity may fall outside ^[2]. In practice, however, most professional liability is pleaded in negligence in any event, particularly where the standard of care is governed by the Bolam and Bolitho tests ^[3][4].

The clause requires three constituent elements to be established by the claimant: a duty of care, a breach of that duty, and damage caused by the breach. The duty of care is determined by reference to Hedley Byrne & Co Ltd v Heller & Partners Ltd (for negligent misstatement) and Caparo Industries plc v Dickman (the tripartite test of foreseeability, proximity and fairness) ^[5][6].

Although displaced from many regulated markets by civil liability wordings, the negligent act, error or omission trigger remains common in policies sold to unregulated professions and in older market wordings.

Legal / Regulatory basis §

The wording is a creature of contract; no statute prescribes its precise form. Its scope is determined by the general English law on the tort of negligence, supplemented by judicial interpretation of similar clauses in PI policies.

The starting point is Donoghue v Stevenson, in which Lord Atkin formulated the neighbour principle as the basis of a duty of care in negligence ^[7]. The tort was extended to pure economic loss caused by negligent words in Hedley Byrne v Heller, where the House of Lords recognised an assumption of responsibility by an adviser to a recipient of advice ^[5]. Caparo v Dickman added the requirement of fairness, justice and reasonableness to the tests of foreseeability and proximity, and confined liability for pure economic loss in negligent misstatement to a class of persons to whom the statement was directed and who used it for the purpose for which it was made ^[6].

The standard of care is set by Bolam v Friern Hospital Management Committee, which holds that a professional is not negligent if their conduct accords with a practice accepted as proper by a responsible body of opinion in the relevant profession ^[3]. The Bolam standard is qualified by Bolitho v City and Hackney Health Authority, under which a court may reject a body of professional opinion that is not capable of withstanding logical analysis ^[4].

The Latent Damage Act 1986 introduced section 14A of the Limitation Act 1980, which provides a three-year period from the date of knowledge for actions in negligence, subject to the fifteen-year long-stop in section 14B ^[8][9]. Many professional negligence claims accordingly proceed under the negligence rubric for limitation reasons.

Within the regulatory architecture, the SRA Minimum Terms and Conditions effectively prohibit a pure negligent act, error or omission trigger in solicitor PI; that market is required to use the broader civil liability formulation ^[10]. For insurance intermediaries, MIPRU 3 does not prescribe the trigger language and either formulation may be used, although civil liability is now the market norm ^[11].

How it works in practice §

When a claim is intimated under a negligent act, error or omission policy, the cover analysis focuses on whether the underlying allegations sound in negligence. If the claimant alleges only breach of an express contractual warranty, breach of a fiduciary duty, or a strict statutory wrong such as a misrepresentation under section 2(1) of the Misrepresentation Act 1967, an insurer may take the position that cover is not engaged. Most practical disputes turn on whether the pleaded facts could be reformulated as negligence.

Two pleading conventions tend to mitigate this risk. First, claimants typically plead in the alternative, advancing negligence alongside contractual breach and statutory cause of action; provided the negligence claim is properly arguable the cover analysis is generally resolved in favour of indemnity. Second, the courts have repeatedly held that where a single set of facts gives rise to concurrent contractual and tortious duties, the claimant may sue in either, following Henderson v Merrett Syndicates Ltd ^[12]. The existence of a concurrent duty in tort is sufficient to engage the trigger.

The wording also creates harder cases. A claim for breach of confidence brought in equity may not be a 'negligent' breach. A claim alleging the firm was vicariously liable for the deliberate wrongdoing of an employee falls outside negligence and may sit awkwardly with the dishonesty exclusion. For these reasons brokers usually recommend the broader civil liability wording where the underwriting market will offer it.

The negligent act, error or omission trigger does not affect the operation of the policy's other operative provisions. The retroactive date, aggregation clause and per-claim limit continue to apply in the usual way. Indeed, because the trigger is narrower, a negligence-only wording is sometimes paired with broader 'extensions' to plug specific gaps, for example defamation cover, IP infringement cover, breach of confidentiality and loss of documents.

Common variations §

Pure NAEO trigger. The narrowest formulation, found in older policies. Requires negligence to be established or pleadable.

NAEO plus listed extensions. A pure trigger expanded by named extensions covering specific non-negligence heads of liability. Typical in SME PI for unregulated professions.

'Wrongful act' wording. Used in directors and officers insurance and some management liability policies, which respond to a broader category of breach of duty than negligence alone.

'Breach of professional duty' wording. A middle ground, found in some chartered surveyor and accountant wordings, broader than negligence but narrower than full civil liability.

Civil liability wording. The modern default for regulated PI, including SRA-prescribed solicitor cover ^[10]. Replaces NAEO with a trigger that responds to any legal liability.

Example §

An illustrative example: a small marketing agency drafts a press release for a client which inadvertently uses the registered trade mark of a competitor. The competitor sues for trade mark infringement under the Trade Marks Act 1994 (strict liability), and joins a claim in passing-off and in negligence in the agency's general professional duties.

Under a pure negligent act, error or omission trigger, the trade mark infringement claim itself is unlikely to be covered, because liability is strict and not founded on a negligent breach of duty. The negligence claim may be covered, but only to the extent the loss is attributable to negligent conduct rather than the strict statutory wrong. A separate IP infringement cover extension would be needed to respond to the trade mark claim itself. Settlement of £40,000 (illustrative only) might be allocated between the heads of claim, with potential coverage disputes about which sums fall within the negligence trigger.

Under a civil liability wording the entire settlement would prima facie be picked up, subject only to specific exclusions and the limit.

See also §

• /wiki/civil-liability/ — the broader modern trigger
• /wiki/breach-of-duty-of-care/ — the constituent element
• /wiki/hedley-byrne-v-heller/ — negligent misstatement
• /wiki/caparo-v-dickman/ — tripartite test
• /wiki/bolam-test/ — standard of professional care
• /wiki/bolitho-test/ — logical analysis qualification
• /wiki/ip-infringement-cover/ — typical extension
• /wiki/professional-indemnity-insurance/ — parent contract

References §

1. ↑ Standard market wordings; SRA Minimum Terms and Conditions of Professional Indemnity Insurance — https://www.sra.org.uk
2. ↑ Hedley Byrne & Co Ltd v Heller & Partners Ltd [1964] AC 465 (HL)
3. ↑ Bolam v Friern Hospital Management Committee [1957] 1 WLR 582
4. ↑ Bolitho v City and Hackney Health Authority [1998] AC 232 (HL)
5. ↑ Hedley Byrne & Co Ltd v Heller & Partners Ltd [1964] AC 465 (HL)
6. ↑ Caparo Industries plc v Dickman [1990] 2 AC 605 (HL)
7. ↑ Donoghue v Stevenson [1932] AC 562 (HL)
8. ↑ Limitation Act 1980, section 14A — https://www.legislation.gov.uk/ukpga/1980/58
9. ↑ Latent Damage Act 1986 — https://www.legislation.gov.uk/ukpga/1986/37
10. ↑ SRA Indemnity Insurance Rules — https://www.sra.org.uk
11. ↑ FCA Handbook, MIPRU 3 — https://www.handbook.fca.org.uk
12. ↑ Henderson v Merrett Syndicates Ltd [1995] 2 AC 145 (HL)